DCRP-35: DSS Enstrophy Replenishment and Outer Affine-Jet Reduction

Replaces DCRP-34's heuristic language with exact vorticity/enstrophy dynamical bookkeeping, proves that a nonzero strictly-DSS core must be sustained by positive vortex stretching or inward enstrophy transport, localizes the unavoidable stretching source to a finite intermediate annular region, and reduces it to a finite-dimensional symmetric trace-free affine strain jet.